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A vibration drill unit capable of obtaining an intensive drilling force. The vibration drill unit includes a first ratchet, anon-rotatable second ratchet having a claw engageable with the claw of the first ratchet, and a main body frame for accommodating a motor, a spindle, the first ratchet and the

A vibration drill unit capable of obtaining an intensive drilling force. The vibration drill unit includes a first ratchet, anon-rotatable second ratchet having a claw engageable with the claw of the first ratchet, and a main body frame for accommodating a motor, a spindle, the first ratchet and the second ratchet. The respective claws of the first ratchet and the second ratchet include the first inclined surfaces formed so as to be engaged in the rotation direction by rotations of the first ratchet and so as to be separated from each other, the second inclined surfaces having greater inclination in the reversed direction than the first inclined surfaces, top parts that link the upper parts of both inclined surfaces to each other, and flat parts that link the bottom parts of both inclined surfaces to each other.

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1. A vibration drill unit, comprising: a motor that is a drive source;a spindle which is driven and rotated in a rotation direction by the motor and is movable in an axial direction thereof;a first ratchet, coupled to the spindle, having convex and concave claws;a non-rotatable second ratchet having

1. A vibration drill unit, comprising: a motor that is a drive source;a spindle which is driven and rotated in a rotation direction by the motor and is movable in an axial direction thereof;a first ratchet, coupled to the spindle, having convex and concave claws;a non-rotatable second ratchet having convex and concave claws engageable with the convex and concave claws of the first ratchet; anda main body frame for accommodating the motor, the spindle, and the first and second ratchets,wherein the respective claws of the first ratchet and second ratchet have a first linearly rising inclined surface formed so as to be separated from each other by being engaged in the rotation direction based on rotations of the first ratchet, a second linearly falling inclined surface having a greater slope in the reverse direction of the first inclined surface than that of the first inclined surface, a ridge portion that links the respective top parts of both the inclined surfaces with each other, and a flat part that links the respective bottom parts of both the inclined surfaces with each other, wherein when the second ratchet engages the first ratchet, the second ratchet imparts a force to the first ratchet, thereby causing vibration in the spindle,wherein a direction of the force imparted by the second ratchet to the first ratchet is in the axial direction of the spindle,wherein the first ratchet and the second ratchet are capable of rotating relative to each other from a state where the ridge portion of one claw of the first and second ratchets abuts with the flat part of the other claw of the first and second ratchets,wherein, in each of the claws, the flat part is longer than the ridge portion in the rotation direction,wherein a spring for causing the second ratchet to slide in the axial direction and pressing the second ratchet to the first ratchet side is compressed and mounted between the second ratchet and the main body frame,wherein vibration drill unit includes an elastic material for absorbing vibrations of the second ratchet such that propagation of vibrations to the main body frame is suppressed, andwherein the elastic material is disposed between the main body frame and the spring. 2. The vibration drill unit according to claim 1, wherein the vibration drill unit can selectively be placed in a drill mode in which the spindle performs a drilling operation or a vibration and drill mode in which the spindle performs a drilling and vibration operation. 3. The vibration drill unit according to claim 1, wherein the vibration drill unit is selectively placed in a drill mode in which the spindle performs a drilling operation or a vibration and drill mode in which the spindle performs a drilling and vibration operation. 4. The vibration drill unit according to claim 2, wherein vibrations of the second ratchet can be effectively absorbed by an elastic material such that propagation of vibrations to the main body frame can be suppressed. 5. A vibration drill unit having a spindle, wherein vibrations are imparted to the spindle in an axial direction thereof, said vibration drill unit comprising: a motor that is a drive source,wherein the spindle is driven and rotated in a rotation direction by the motor and is movable in an axial direction thereof;a first ratchet, coupled to the spindle, having convex and concave claws;a non-rotatable second ratchet having convex and concave claws engageable with the convex and concave claws of the first ratchet; anda main body frame for accommodating the motor, the spindle, and the first and second ratchets,wherein the respective claws of the first ratchet and second ratchet have a first linearly rising inclined surface formed so as to be separated from each other by being engaged in the rotation direction based on rotations of the first ratchet, a second linearly falling inclined surface having a greater slope in the reverse direction of the first inclined surface than that of the first inclined surface, a ridge portion that links the respective top parts of both the inclined surfaces with each other, and a flat part that links the respective bottom parts of both the inclined surfaces with each other, wherein when the second ratchet engages the first ratchet, the second ratchet imparts a force to the first ratchet, thereby causing vibration in the spindle,wherein a direction of the force imparted by the second ratchet to the first ratchet is in the axial direction of the spindle,wherein the direction of the force imparted by the second ratchet to the first ratchet in the axial direction of the spindle causes vibration of the spindle in the axial direction,wherein the first and second ratchets are arranged so that the convex and concave claws of the first and second ratchets are facing each other along a circumferential direction of the spindle,wherein the flat parts of the first and second ratchets each forms a right angle with the axial direction of the spindle so that an impact force between the flat parts and the ridge portions are coaxially transmitted to the spindle,wherein, in each of the claws, the flat part is longer than the ridge portion in the rotation direction,wherein a spring for causing the second ratchet to slide in the axial direction and pressing the second ratchet to the first ratchet side is compressed and mounted between the second ratchet and the main body frame,wherein vibration drill unit includes an elastic material for absorbing vibrations of the second ratchet such that propagation of vibrations to the main body frame is suppressed, andwherein the elastic material is disposed between the main body frame and the spring. 6. The vibration drill unit according to claim 1, wherein, when the first ratchet rotates in a state where the ridge portion of one claw is in contact with the flat part of the other claw, the spindle does not move along the axial direction. 7. The vibration drill unit according to claim 1, wherein the flat parts are formed to be substantially orthogonal to the axial direction. 8. A vibration drill unit, comprising: a motor that is a drive source;a spindle which is driven and rotated in a rotation direction by the motor and is movable in an axial direction thereof;a first ratchet, coupled to the spindle, having convex and concave claws; anda second ratchet disposed slidably in the axial direction but not rotatably in a circumferential direction on the spindle, the second ratchet having convex and concave claws engageable with the convex and concave claws of the first ratchet,wherein said respective claws of the first ratchet and second ratchet including a first linearly rising inclined surface and a second linearly falling inclined surface having a greater slope in the reverse direction of the first inclined surface than that of the first inclined surface, a ridge portion that links the respective top parts of both the inclined surfaces with each other, and a bottom portion having a flat surface and linking the respective bottom parts of both the inclined surfaces with each other;a first spring that presses the second ratchet in a first axial direction so as to have a space between the first and the second ratchet; anda housing for accommodating the motor, the spindle, and the first and second ratchets,wherein when the drill is pressed to a material to be drilled, the second ratchet engages the first ratchet so as to cause vibration in the spindle,wherein the vibration drill further comprises: a second spring that presses the second ratchet in a second axial direction which is opposite to the first axial direction; andan elastic member disposed at a position adjacent to the second ratchet to absorb vibrations caused by the second ratchet to a main body frame, andwherein the elastic material is disposed between the main body frame and the second spring. 9. The vibration drill unit according to claim 8, which further comprises: an operation mode change switch provided on the housing so as to select one of a drill mode in which the spindle performs a drilling operation and a vibration and drill mode in which the spindle performs a drilling and vibration operation. 10. The vibration drill unit according to claim 8, wherein the second ratchet comprises: an inner cylindrical member and an outer cylindrical member connected to each other and a movable ring is provided movably along the outer circumference of the inner cylindrical member. 11. The vibration drill unit according to claim 10, wherein when a pressing force operating on the drill is less than a predetermined value, predetermined spacing is always secured between the movable ring and a fixed ring disposed in the housing. 12. A vibration drill unit comprising: a motor that is a drive source;a spindle which is driven and rotated in a rotation direction by the motor and is movable in an axial direction thereof;a first ratchet, coupled to the spindle, having convex and concave claws; anda second ratchet disposed slidably in the axial direction but not rotatably in a circumferential direction on the spindle, the second ratchet having convex and concave claws engageable with the convex and concave claws of the first ratchet,wherein said respective claws of the first ratchet and second ratchet including a first linearly rising inclined surface and a second linearly falling inclined surface having a greater slope in the reverse direction of the first inclined surface than that of the first inclined surface, a ridge portion that links the respective top parts of both the inclined surfaces with each other, and a bottom portion having a flat surface and linking the respective bottom parts of both the inclined surfaces with each other;a housing for accommodating the motor, the spindle, and the first and second ratchets,wherein when the second ratchet engages the first ratchet, the second ratchet imparts a force to the first ratchet, thereby causing vibration in the spindle,wherein the flat parts of the first and second ratchets each forms a right angle with the axial direction of the spindle so that an impact force between the flat parts and the ridge portions are coaxially transmitted to the spindle,wherein a spring for causing the second ratchet to slide in the axial direction and pressing the second ratchet to the first ratchet side is compressed and mounted between the second ratchet and a main body frame, andwherein vibration drill unit includes an elastic material for absorbing vibrations of the second ratchet such that propagation of vibrations to the main body frame is suppressed, andwherein the elastic material is disposed between the main body frame and the spring. 13. A vibration drill comprising the vibration drill unit according to claim 1. 14. A vibration drill unit, comprising: a motor;a spindle that is driven and rotated by the motor and is movable in an axial direction;a first ratchet coupled to the spindle;a second ratchet engageable with the first ratchet; anda main body frame that accommodates the second ratchet,wherein the first ratchet includes: a first linearly rising inclined surface; anda second linearly falling inclined surface, wherein an inclination of the first linearly rising inclined surface is larger than an inclination of the second linearly falling inclined surface,wherein the second ratchet includes: a third linearly rising inclined surface; anda fourth linearly falling inclined surface, wherein an inclination of the third linearly rising inclined surface is larger than an inclination of the fourth linearly falling inclined surface,wherein the first ratchet further includes a flat portion connecting a lower end of the first linearly rising inclined surface and a lower end of the second linearly falling inclined surface,wherein the second ratchet further includes a ridge portion connecting an upper end of the third linearly rising inclined surface and an upper end of the fourth linearly falling inclined surface,wherein the flat portion is longer than the ridge portion,wherein a spring for causing the second ratchet to slide in the axial direction and pressing the second ratchet to the first ratchet side is compressed and mounted between the second ratchet and the main body frame,wherein vibration drill unit includes an elastic material for absorbing vibrations of the second ratchet such that propagation of vibrations to the main body frame is suppressed, andwherein the elastic material is disposed between the main body frame and the spring.